void main() {
  (int x, int y, int z) point = (1, 2, 3);
  (int r, int g, int b) color = (1, 2, 3);
  print(
    '比较 (int x, int y, int z) 和 (int r, int g, int b): ${point == color}',
  ); // Prints 'true'.

  ({int x, int y, int z}) point2 = (x: 1, y: 2, z: 3);
  ({int r, int g, int b}) color2 = (r: 1, g: 2, b: 3);
  print(
    '比较 ({int x, int y, int z}) 和 ({int r, int g, int b}): ${point2 == color2}',
  ); // Prints 'false'.
}
